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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f7e55d98591d1e03deb370b2ab8eb8eab0dadaff48a4417ab82700113b0d3f' 
  AND token = 'cSYI38asijIKVtUcKPcCHGyT8TVVokMDwMQkxLSdWLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}